Related Clues:
- Tunneling expert
- Intelligence agency problem
- Another tunnel-creating rodent
- Infiltrating spy
- Messenger informally reports one of those responsible for underground movement
- Inside informant
- Spy a mark on the skin
- Mountain Goats song for a double agent?
- Roger Glover "Old Blind ___"
- Alfie "Hey ___"
- Double agent for competing record company
- Minnesota athlete
- Underground pest
- Garden tunneler
- Long-term agent